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प्रश्न
What type of oxides are formed when metals combine with oxygen? Explain with the help of an example.
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उत्तर
When metals react with oxygen to form metal oxides. Metal oxides are basic in nature. Some of the metal oxides react with water to form alkalis. Metal oxides, being basic, turn red litmus solution blue.
The intensity of the reaction with oxygen depends on the metal’s chemical reactivity. Certain metals react with oxygen at ambient temperature; others require heating, while some require intense heating to react.
Sodium metal reacts with the oxygen of air at room temperature to form a basic oxide called sodium oxide.
\[\ce{\underset{(Metal)}{\underset{Sodium}{4Na_{(s)}}} + \underset{(From air)}{\underset{Oxygen}{O2_{(g)}}} -> \underset{(Basic oxide)}{\underset{Sodium oxide}{2Na2O_{(s)}}}}\]
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संबंधित प्रश्न
_________ solution is blue in colour.
(a) CuSO4
(b) FeSO4
(c) ZnSO4
(d) Al2(SO4)3
Iron is
(a) More reactive than zinc
(b) More reactive than aluminium
(c) Less reactive than copper
(d) Less reactive than aluminium
You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels.
A solution of _________________ in water is green in colour.
(a) CuSO4
(b) FeSO4
(c) ZnSO4
(d) Al2(SO4)3
State whether the following statement is true or false:
Non-metals react with dilute acids to produce a gas which burns with a ‘pop’ sound.
What changes in the colour of iron nails and copper sulphate solution do you observe after keeping the iron nails dipped in copper sulphate solution for about 30 minutes?
Name two metals which form amphoteric oxides.
Write an equation for the reaction of:
Magnesium with oxygen
Give reasons for the following:
Blue colour of copper sulphate solution is destroyed when iron filings are added to it.
Which of the following elements would yield a basic oxide?
Na, S, C, K, H
Describe the reaction of potassium with water. Write the equation of the reaction involved.
Which gas is produced when dilute hydrochloric acid is added to a reactive metal?
Name two metals (other than zinc and iron) which can displace hydrogen from dilute hydrochloric acid?
What is the action of water on sodium? Write the equation of the chemical reaction involved.
Write one reaction in which aluminium oxide behaves as a basic oxide and another in which it behaves as an acidic oxide.
One of the following is not a neutral oxide. This is:
A basic oxide will be formed by the element ______.
An element X reacts with hydrogen, when heated, to form a covalent hydride H2X. If H2X has a smell of rotten eggs, the element X is likely to be ______.
Which one of the following four metals would be displaced from the solution of its salt by the other three metals?
Metal A burns in air, on heating, to form an oxide A2O3 whereas another metal B burns in air only on strong heating to form an oxide BO. The two oxides A2O3 and BO can react with hydrochloric acid as well as sodium hydroxide solution to form the corresponding salts and water.
- What is the nature of oxide A2O3?
- What is the nature of oxide BO?
- Name one metal like A.
- Name one metal like B.
